How to complete the process of unlocking my iPhone 4?

So I had this guy unlock my phone


This guy here

And i need an unsupported SIM card…
I don't threw out my original sim thinking I wouldn't need it
What is a unsupported SIM card and where can I get one?
Supposedly I can just put the unsupported sim in the phone and connect to iTunes and my phone will be unlocked
Where do I get one of those sims? Any regular cellphone store?

I don't think there are such SIMs which can unlock your phone

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